Exodus 31-17: It will be a sign between me and the Israelites for ever, for in six days the LORD made the heavens and the earth, and on the seventh day he rested and was refreshed.
Sounds like he does not allow anyone to outdo him, and that to prove he is the best, everyone else should not be allowed to work harder than him.
Exodus 34-10 […] The people you live among will see how awesome is the work that I, the LORD, will do for you.
Exodus 34-14 Do not worship any other God, for the LORD, whose name is jealous, is a jealous god. (Mentioned several times before already)
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